If I was ever to feed kibble I would definitely add water! Just like when I feed ZiwiPeak. It's a freeze dried food so I always add water. It helps them have the moisture they need to process as well as slows them down a bit.
Stella & Chewy's is a WONDERFUL food & we feed it a lot ourselves. Honest Kitchen is great as well because you have to add water to make the food.
You're on the right track though...if not switch to a food that has moisture in it (Stella & Chewy's, Honest Kitchen) than add water. As for canned foods--the best one I've found is the wet ZiwiPeak. I don't think I'd personally be comfortable feeding a canned food as a primary food as it is still "cooked" per say. But saying that, I do add this in our rotation now & again as well.
Good luck in your decision & search!